/* ==========================================================================
   Child LoveTank Official HTML Site - Modern Premium CSS
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --font-body: 'Plus Jakarta Sans', sans-serif;
  --font-heading: 'Outfit', sans-serif;

  /* Color Palette */
  --primary: #FF5E7E;
  --primary-coral: #FF7B54;
  --primary-amber: #FFB26B;
  --gradient-primary: linear-gradient(135deg, #FF5E7E 0%, #FF7B54 50%, #FFB26B 100%);
  --gradient-hover: linear-gradient(135deg, #FF476B 0%, #FF683F 100%);
  --gradient-dark: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  
  --bg-page: #FFFBF8;
  --bg-surface: #FFFFFF;
  --bg-surface-glass: rgba(255, 255, 255, 0.85);
  --text-main: #1E293B;
  --text-muted: #64748B;
  --border-subtle: rgba(255, 123, 84, 0.15);

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 30px -10px rgba(255, 94, 126, 0.12);
  --shadow-lg: 0 20px 40px -12px rgba(255, 94, 126, 0.22);
  
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Overrides */
[data-theme="dark"] {
  --bg-page: #0B0F19;
  --bg-surface: #151D2A;
  --bg-surface-glass: rgba(21, 29, 42, 0.9);
  --text-main: #F1F5F9;
  --text-muted: #94A3B8;
  --border-subtle: rgba(255, 123, 84, 0.25);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 40px -12px rgba(0, 0, 0, 0.6);
}

/* General Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Gradient Utility */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* Buttons */
.btn-primary {
  background: var(--gradient-primary);
  color: #FFFFFF !important;
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 10px 25px -5px rgba(255, 94, 126, 0.4);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 35px -5px rgba(255, 94, 126, 0.55);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main) !important;
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  border: 2px solid var(--border-subtle);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary) !important;
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
  transition: all var(--transition-normal);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-brand img {
  height: 42px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.theme-toggle-btn {
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  transform: rotate(15deg);
  border-color: var(--primary);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 992px) {
  .nav-menu {
    position: fixed;
    top: 75px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    flex-direction: column;
    padding: 32px;
    gap: 20px;
    border-bottom: 1px solid var(--border-subtle);
    display: none;
    box-shadow: var(--shadow-lg);
  }
  .nav-menu.active {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
}

/* Sections */
.section {
  padding: 100px 0;
  position: relative;
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 94, 126, 0.1);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
  border: 1px solid rgba(255, 94, 126, 0.2);
}

.section-header h2 {
  font-size: 2.6rem;
  margin-bottom: 16px;
}

@media (max-width: 768px) {
  .section-header h2 {
    font-size: 2rem;
  }
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* Hero Section */
.hero {
  padding: 160px 0 100px 0;
  background: radial-gradient(circle at 85% 15%, rgba(255, 123, 84, 0.12) 0%, transparent 55%),
              radial-gradient(circle at 10% 70%, rgba(255, 94, 126, 0.08) 0%, transparent 45%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero-content h1 {
  font-size: 3.6rem;
  font-weight: 800;
  margin-bottom: 24px;
}

@media (max-width: 992px) {
  .hero-content h1 {
    font-size: 2.6rem;
  }
}

.hero-content p {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 992px) {
  .hero-actions {
    justify-content: center;
  }
}

.hero-visual {
  position: relative;
}

.hero-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 4px solid rgba(255, 255, 255, 0.6);
}

/* Floating Tank Gauge Widget */
.floating-gauge-card {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: var(--bg-surface-glass);
  backdrop-filter: blur(12px);
  padding: 18px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 16px;
  animation: floatWidget 4s ease-in-out infinite;
}

@keyframes floatWidget {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.gauge-bar-track {
  width: 130px;
  height: 10px;
  background: #E2E8F0;
  border-radius: 5px;
  overflow: hidden;
  margin-top: 6px;
}

.gauge-bar-fill {
  height: 100%;
  width: 96%;
  background: var(--gradient-primary);
  border-radius: 5px;
}

/* Interactive Calculator Widget Section */
.calc-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  max-width: 800px;
  margin: 0 auto;
}

.calc-slider-group {
  margin-bottom: 28px;
}

.calc-slider-group label {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  margin-bottom: 10px;
}

.calc-slider {
  width: 100%;
  height: 8px;
  background: #E2E8F0;
  border-radius: 4px;
  outline: none;
  -webkit-appearance: none;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(255, 94, 126, 0.4);
}

.calc-result-box {
  background: rgba(255, 94, 126, 0.06);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  margin-top: 30px;
  border: 1px solid rgba(255, 94, 126, 0.2);
}

/* 4 Pillars Grid */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

@media (max-width: 992px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

.card-pillar {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  height: 100%;
}

.card-pillar:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.pillar-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 1.5rem;
  margin-bottom: 20px;
  box-shadow: 0 8px 20px -6px rgba(255, 94, 126, 0.4);
}

.card-pillar h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.card-pillar p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Comparison Grid */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.comp-card {
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

.comp-full {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, var(--bg-surface) 100%);
  border-color: rgba(16, 185, 129, 0.3);
}

.comp-low {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.05) 0%, var(--bg-surface) 100%);
  border-color: rgba(239, 68, 68, 0.3);
}

.comp-list {
  list-style: none;
  margin-top: 24px;
}

.comp-list li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 14px;
  font-weight: 500;
}

.comp-full .comp-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #10B981;
  font-weight: 800;
  font-size: 1.2rem;
}

.comp-low .comp-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #EF4444;
  font-size: 1.8rem;
  line-height: 0.8;
}

/* 5 Love Languages Cards */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

@media (max-width: 992px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

.lang-card-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.lang-card-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.lang-badge {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.lang-card-item h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.lang-card-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

/* FAQ Accordion */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.faq-question {
  width: 100%;
  padding: 24px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-answer {
  padding: 0 24px 24px 24px;
  color: var(--text-muted);
  display: none;
  font-size: 1rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-question {
  color: var(--primary);
}

/* Testimonial Cards */
.testimonial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  height: 100%;
}

.stars {
  color: #F59E0B;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 24px;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #FFF;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* CTA Banner */
.cta-banner {
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  padding: 80px 40px;
  color: #FFFFFF;
  text-align: center;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.cta-banner h2 {
  color: #FFFFFF;
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 1.2rem;
  opacity: 0.95;
  max-width: 620px;
  margin: 0 auto 36px auto;
}

/* Footer */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 320px;
}

.footer-col h4 {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--text-muted);
  font-weight: 500;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
}